US3830974A - Video signal generator - Google Patents

Video signal generator Download PDF

Info

Publication number
US3830974A
US3830974A US00276911A US27691172A US3830974A US 3830974 A US3830974 A US 3830974A US 00276911 A US00276911 A US 00276911A US 27691172 A US27691172 A US 27691172A US 3830974 A US3830974 A US 3830974A
Authority
US
United States
Prior art keywords
signals
matrix
signal
mixing
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00276911A
Other languages
English (en)
Inventor
M Dupouy
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US3830974A publication Critical patent/US3830974A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/74—Circuits for processing colour signals for obtaining special effects
    • H04N9/76—Circuits for processing colour signals for obtaining special effects for mixing of colour signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/222—Studio circuitry; Studio devices; Studio equipment
    • H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
    • H04N5/272—Means for inserting a foreground image in a background image, i.e. inlay, outlay
    • H04N5/275—Generation of keying signals

Definitions

  • the present invention relates to the production of fixed and animated displays. More specifically, this invention is directed to apparatus for generating displays for viewing on a standard television receiver. Accordingly, the general objects of the present invention are to provide novel and improved methods and apparatus of such character.
  • the present invention is particularly well suited for the generation of complex periodic electrical signals which may be employed, after suitable adaptation, to create fixed or animated displays on the screen of a standard television receiver.
  • Electronic circuits are known which enable geometrical displays to be produced on the screens of cathode-ray tubes.
  • These prior art devices may, for example, be employed to generate a signal which, when applied to the signal input of a television receiver, will produce a pictorial representation of an object such as a workpiece.
  • the prior art display signal generators are extremely complex electronic devices which are incapable of causing the generation of geometrically pure figures on the cathode-ray tube display. Traditionally, the adaptation of these display signal generation devices to existing television systems is difficult and costly.
  • the present invention overcomes the above briefly discussed and other disadvantages of the prior art by providing an improved technique and apparatus for producing desired effects on the screen of a television receiver.
  • Apparatus in accordance with the present invention is uncomplicated, easy to use and enables an infinite variety of fixed or animated displays to be created. While the principal object of the invention is to produce decorative and fanciful pattern displays, the invention may also be employed to achieve predetermined geometrical displays.
  • the present invention is predicated on the use of lirie or frame coherent periodic signals.
  • coherent periodic signal means a periodic signal which is rephased at each line or frame signal.
  • the coherent periodic signals of the present invention are at a frequency which is equal to or near the receiver line or frame scanning frequency or a multiple thereof.
  • signals of different frequencies may be employed.
  • the method of the present invention encompasses the production of at least one complex signal by intersection of a variable reference potential with at least one periodic signal having a frame or line coherence.
  • the invention contemplates apparatus comprising at leastone signal generator for producing a line or frame coherent periodic signal and a comparator circuit wherein the magnitude of the coherent periodic signal is compared with a variable reference potential.
  • the comparator circuit generates a complex output signal capable of having. two states; these states or levels respectively being commensurate with two colors of the TV display.
  • the output signals of the comparator circuit are applied to the TV receiver via a video adaptation circuit.
  • FIG. 1 is a block diagram of a first embodiment of the invention
  • FIG. 2 is a representation of a display which may be obtained through employment of the embodiment of FIG. 1, FIG. 2 also depicting waveforms which appear at various points in the circuit of FIG. 1;
  • FIG. 3 is a block diagram of a second embodiment of the invention.
  • FIG. 4 is a block diagram of a third embodiment of the invention.
  • FIG. 5 is a logic circuit diagram relating to the embodiment of FIG. 4;
  • FIG. 6 is a block diagram of a preferred embodiment of the invention, the embodiment of FIG. 6 being especially designed for use with a color television receiver;
  • FIG. 7 is a representation of a control panel which may be employed with the embodiment of FIGS. 4 and 5;
  • FIG. 7a is a cross-sectional side elevation view of a connector particularly well suited for use with the invention.
  • apparatus in accordance with the invention includes a video adaptation circuit.
  • Such adaptation circuits comprise a synchronization signal generator and a video/synchro mixer which provide, in the manner well known in the art, a composite video signal and line and frame synchronization signals.
  • Synchronization signal generators and video/synchro mixers are well known in the art, typically being employed in television cameras, and thus will not be described in further detail herein.
  • a preferred embodiment of the invention comprises a pair of signal generators GL and GT which produce periodic signals. These periodic signals will typically have a sinusoidal waveform.
  • the output signals of generators GL and GT are brought into phase with the line and frame synchronization signals supplied by the adaptation circuit CV.
  • the synchronization is shown diagramatically in FIG. 1 by the application of the SL (line synchronization) signal from the adaptation circuit to generator GL and by the application of the ST (frame synchronization) signal to generator GT.
  • the outputs of signal generators GL and GT are interconnected at summing junction P to produce a complex signal having a maximum potential commensurate with the center of the screen of the receiver.
  • the output potential of the two signal generators may be adjusted by means of respective potentiometers R and R.
  • the complex signal V appearing at junction P is applied to a first input of a comparator C.
  • the second input to comparator C is derived from a DC source V and applied to the comparator via a potentiometer r".
  • the output of comparator C has only two levels corresponding to black and white.
  • the threshold potential V as set by potentiometer R
  • the comparator output potential will shift" and a small white circle will be created at the center of the display. The size of this circle will increase as the threshold potential V is lowered.
  • FIG. 2 In one reduction to practice of the invention, in order to obtain the above briefly described display, a SOI-Iz sinusoidal signal phased on the frame synchronization signal and a 15.62 Hz sinusoidal signal phased on the line synchronization signal were employed.
  • the picture obtained with the aid of these signals is represented schematically in FIG. 2 on a screen E.
  • screen E In the interest of clarity, screen E is shown in FIG 2 as being encompassed by only lines of horizontal scan.
  • FIG. 2 also depicts the reference potential V, the development of the complex signal V at summing junction P, the black and white raster levels n and b and the synchronization signal T. It is believed that joint consideration of FIG. 1 and 2 will clearly reveal to those skilled in the art the manner in which the white circle of PEG. 2 is produced at the center of the screen of a television receiver.
  • sinusoidal signals can be added to the complex signal which comprises the V input to comparator C in the interest of varying the display. While these additional signals may be of any frequency, in order to obtain a stable picture the additional signals must be coherent and for this purpose are brought back into phase at each line or frame.
  • two frame synchronized signals and two line synchronized signals may be employed.
  • Such an embodiment is represented in FIG. 3 and comprises two sinusoidal voltage generators GL1 and GL2 which are brought into phase by line synchronization signals and two sinusoidal voltage generators GT1 and GT2 which are brought into phase by the frame synchronization signals.
  • these four signal generators include electronic control means which enables the frequencies of the generated sinusoidal signals to be adjusted.
  • the int output frequencies can, for example, be varied between Oand 500 Hz while the output frequencies of generators GT1 and GT2 can be varied between 0 and 1,500 I-Iz.
  • Electronic frequency control suitable for application to the present invention may be achieved through the use of beat-frequency oscillators of the type which will be described below in the discussion of FIG. 6.
  • the embodiment of FIG. 3 additionally comprises signal generators GL1 and GT2 which produce sawtooth waveforms.
  • Sawtooth generators GL1' and GT2 are respectively synchronized with the line and frame synchronization signals.
  • the FIG. 3 embodiment thus includes means for generating six signals of the same amplitude; i.e., two sinusoidal signals and one sawtooth signal with frame coherence and two sinusoidal and one sawtooth signal with line coherence. These six signals are applied, via respective adjustable resistors R1- R6, to summing junction P to obtain a complex waveform V.
  • the complex signal V is applied to the first input of comparator C.
  • the other input to the comparator is supplied with the variable DC voltage V.
  • the output signals from comparator C are applied to the television receiver via the video adaptation circuit CV.
  • the signal generators GL1 and GT2 can be comprised of circuitry which produces any coherent exponential signal and thus sawtooth generators have been described by way of illustration only.
  • FIG. 1 and 2 provide out put signals having only two states, respectively commensurate with 0 and 1", only black and white pictures may be obtained therewith.
  • FIG. 4 An example of a half-tone system is depicted in FIG. 4.
  • the embodiment of FIG. 4 comprises four generator units G1, G2, G4 and G4; each generator unit comprising at least one signal generator for producing a line coherent signal and one frame coherent signal generator.
  • the output signals of each unit are added at summing junctions P1, P2, P3 and P4 respectively and the complex signals V1, V2, V3 and V4 thus obtained are each applied to one of the inputs to comparators C1-C4.
  • Reference potentials V1, V2, V3 are respectively applied to the other inputs of the four comparators.
  • Each of the comparators provides an output signal; represented on FIG. 4 as a, b, c and d; which can have 0" and 1 states.
  • the four comparator output signals are combined, at summing junction P5, to produce a single output signal e which may have five different states.
  • the output signals a, b, c and d mixed at junction P5 must, of course, have the same characteristics.
  • Application of output signal e to a TV receiver via a video adaption circuit results in a number of halftones being obtainable on the screen in addition to pure black and white signals. It is to be noted that as few as two or more than four comparators may be employed in the practice of the embodiment of FIG. 4.
  • FIG. 5 shows an exemplary logic circuit respectively comprising NAND and AND quadruple circuits 74 and 75; circuits 74 and 75 being commercially available integrated circuits.
  • the output signals of comparators C1-C4 are applied to the corresponding inputs ad of circuits 74 and 75.
  • the logic circuits enables the following functions to be generated: a+b, b+c, (1+6, a+ db, ab, db, ca, and ab+cd.
  • the signals obtained at the outputs of the logic circuit can, after resistance matrixing, be applied directly to the input of the video adaptation circuit. Accordingly, employment of the embodiment of FIG. 4 in conjunction with the logic circuit of FIG. 5 permits the generation of twelve video signals of different level. While a complex logic circuit receiving the outputs of more than four comparators can be employed, the use of four comparators enables many special effects to be obtained with a relatively simple logic circuit. It may be noted that the delivery of the output signals of two comparators to an exclusible OR circuit enables a chess board effect to be produced on the screen. By employing not AND logic, different shapes may be fused while AND logic enables the summing of two shapes. A simple inversion, of course, enables a negative picture to be produced.
  • additional signals may be obtained by applying the output signals of logic circuits 74 and 75 to additional resistive matrices.
  • C1-C4 is preferably also achieved by resistive matrixing. Such matrixing is shown in FIG. 6.
  • FIG. 6 a block diagram of a preferred embodiment of the present invention is shown.
  • the embodiment of FIG. 6 generates three signals which enable fixed or moving displays to be produced on the screen of a color television receiver.
  • One of these three signals may be used alone, of course, to produce a black and white display.
  • the FIG. 6 embodiment comprises a video adaptation circuit VC which, for color television, comprises at least one video encoder circuit 10 with three inputs ll, 11' and 11" for the three signals corresponding to red, green and blue.
  • the video adaptation circuit also comprises a basic signal generator 12 which provides, at terminals 13 and 14, the line and frame synchronization signals SL and ST respectively.
  • the adaptation circuit includes HF modulator 15.
  • the video adaptation circuit while being adapted to the particular color television system used, is in accordance with the prior art.
  • seven periodic signals Vl-V7 with line or frame coherence are produced. These periodic signals are passed through filters Fl-F6, as appropriate, and a low impedance distribution circuit 16 prior to being mixed by means of a resistive matrix 20.
  • the complex signals obtained at each intersection of matrix 20 are I 7' selectively applied to first inputs of four comparators Cl-C4.
  • the second input terminal of each comparator is connected, through respective potentiometers 30, 31, 32 and 33, to a source of a reference potential V.
  • the output signals provided by comparators C1-C4 are delivered to the inputs of logic circuit 40 which may be similar to the circuit shown in FIG. 5.
  • the outputs of logic circuit 40 are combined in a resistive matrix 41 and the thus generated signals are applied to the inputs ll, 11 and 11" of the encoder 10 of the adaptation circuit.
  • the seven periodic signals employed in the circuit are produced by four signal generators G1, G2, G3 and G4 and the basic signal generator 12 of the video adaptation circuit.
  • Signal V1 consists of a sawtooth waveform obtained by applying the line synchronization signal SL through an RC filter Fl which converts the square wave produced by signal generator 12 into the desired sawtooth wave.
  • Signal V7 is obtained in the same manner by passing the frame synchronization signal SL from generator 12 through filter F2.
  • Signal V4 is a sinusoidal signal obtained by passing the SL signal through filter F5.
  • Signals V2, V3 and V5 are produced by signal generators G4, G3 and G2 respectively.
  • Signal generator G1 is an oscillator which produces a variable frequency output; the output of G1 being at a frequency slightly higher or lower than the frame frequency tt or a multiple thereof; i.e., tt i 2 Hz.
  • the output frequency of generator-oscillator G1 can be adjusted through the use of potentiometer 34.
  • Signal generator G1 is a free running oscillator and the output signal provided thereby is applied directly through the distribution circuit 16 to matrix 20.
  • the signal generator G2 produces a variable frequency sinusoidal waveform of, for example, between 0-1000 Hz.
  • the output of G2 is applied to the distribution circuit through filter F6.
  • Signal generators G3 and G4 supply sinusoidal waveforms of variable frequency, between 0 and 200 kHz, which are applied to distribution circuit 16 via band pass filters F3 and F4 respectively.
  • the output frequencies of signal generators G2, G3 and G4 are adjustable by means of respective potentiometers 37, 36 and 35.
  • these signal generators consist of beat-frequency oscillators of a type well known in the art which are brought back into phase at each line or frame synchronization signal.
  • Signal generator G2 comprises an oscillator 50 which operates at the line'scanning frequency. Oscillator 50 can be modulated i 1000 Hz with respect to the line frequency and is phased therewith by the output of a gate circuit 51.
  • the inputs to gate circuit 51 are the line and frame synchronization signals SL and ST. Through operation of the gate circuit each frame signal blocks the oscillator thereby causing the oscillator to start in phase with the line signal.
  • the output of oscillator 50 is applied to a first input of a mixer circuit 52.
  • the line synchronization signal SL is delivered to the other input of mixer circuit 52 whereby the mixer provides an output signal which can be modulated in frequency from 0-1000 Hz. This signal is delivered to distribution circuit 16 and matrix 20 via the band pass filter F6.
  • Signal generators G3 and G4 which produce signals phased with the line synchronization signal, each receive the output of a free running quartz crystal controlled oscillator 60 which operates at the line frequency, a multiple of the line frequency or, preferably, at 7 mHz.
  • the output of oscillator 60 may be frequency modulated by i 200 Hz in a manner known in the art through the use of potentiometer 38.
  • the output signal of oscillator 60 is applied to first inputs of mixer circuits 61 and 62.
  • the second input of mixer 61 of signal generator G3 is supplied from an oscillator 64.
  • the second input of mixer 62 of signal generator G4 is supplied by the output of an oscillator 63.
  • Oscillators 63 and 64 operate at the same frequency as oscillator 60 and can, as noted above, be frequency modulated with the aid of potentiometers 36 and 37 respectively. Oscillators 63 and 64 are adjusted in phase on the line syncronization signal with the aid of a gate circuit 65. The line synchronization signal is applied to a first input of gate 65 while the second input of the gate circuit is supplied from a master oscillator 66. The oscillators 63 and 64 are thus blocked at each line signal SL and therefor start with a constant phase. The beating of the output signals of oscillators 63 and 64 with the signal of free running oscillator 60 provides, at the outputs of mixers 61 and 62, signals adjusted in phase on the line synchronization.
  • the circuitry of FIG. 6 enables a special phenomena to be obtained.
  • a very slight adjustment of the output frequency of oscillator 60 causes a translational vertical movement of the display; the direction of movement being dependent on the direction of adjustment and the sign of the difference between the frequency of oscillator 60 and that of the blocked oscillators 63 and 64.
  • upward translational movement can be obtained for one signal while simultaneously a downward translational movement can be obtained for the other.
  • the matrix comprises supplemental matrices 20', 20" and 20" which enable the coherent signals to be appled, via capacitors 22 and conductors 21, to the modulation inputs of oscillators 50, 63 and 64.
  • This arrangement enables additional effects and cyclic variations to be obtained.
  • the apparatus of FIG. 6 further comprises a very low frequency oscillator 70 having output terminals 71, 72 and 73.
  • Oscillator 70 may, for example, provide output signals at 1 Hz, 0.1 Hz and 0.01 Hz respectively at output terminals 71, 72 and 73.
  • These low frequency signals are applied, through a low impedance distribution circuit 75, to a matrix 76.
  • matrix 76 the low frequency signals are mixed with the reference potentials for comparators C1-C4 or the steady state frequency modulation potentials of oscillators 50, 63 and 64.
  • Demodulated musical signals can also be applied to matrix 76; for example by a demodulation circuit 77.
  • the matrices 20, 41 and 76 are resistive matrices.
  • the connections within the matrices are obtained with the aid of connectors of the type shown in FIG. 7a.
  • a connector 80 is shown which comprises a resistor 81 embedded in a plastic body 82.
  • the terminals of resistor 81 are connected to the terminals of a male coaxial plug 83 fitted into the lower end of plastic body 82.
  • Coaxial plug 83 will be received in a socket 84 having terminals connected to the the lines and columns, respectively indicated at 85 and 86, of the matrices.
  • the resistors 81 may be replaced by capacitors of suitable value in the interest of obtaining bloom, clear and stereoscopic effects to the level of the matrixing of the logic signals provided by matrix 41. While the use of resistance elements of different values in the connectors enables a signal to be restored to several levels, replacing the resistance elements with different capacitors enables only the transition of one signal to be transmitted. Passage from the 0 state to the l state produces a white line and return to the 0 state a black line. These lines, clear to the left and shaded off to the right, may be employed to give the illusion of a stereoscope for a particular shape. With other signals, however, the capacitors will produce a different effect.
  • the 0 state is defined at the output by a saturated transistor.
  • the capacitance would therefor be grounded and the transition time of the other signals thus impaired producing a bloom effect.
  • the capacitance is effectively open and the potential can therefor not fall below a predetermined level but can rise. Accordingly, there is no longer any impairment of the other signals and the display again becomes clear.
  • a clear display can therefor be made to appear on the outside of a shape produced with a blurred display on the inside thereby providing an illusion of a moving stereoscopic shape.
  • the impression of a blurred drop of water running across a chess board while the chess board itself undergoes gradual distortion can be produced.
  • FIG. 7 is a representation of a control panel which may be employed with the circuitry of FIG. 6 including the connectors of FIG. 7a.
  • FIG. 7 indicates the shaping matrix 20 for mixing the periodic signals Vl-V7 as well as the matrices 41 for mixing the logic signals and 76 for mixing the reference potentials of the comparators with the low frequency signals from oscillator or the demodulated signals from circuit 77.
  • FIG. 7 also depicts the control knobs for potentiometers 30-38.
  • Two additional potentiometers 39-39 which enable the levels of the demodulated musical signals applied to matrix 76 to be controlled, are also represented in FIG. 7.
  • FIG. 7 facilitates the creation of the different effects and displays which can be produced by the present invention on the screen of either a black and white or color television receiver.
  • the output signals of comparator C1-C4 of the FIG. 6 embodiment are indicated by reference characters A, B, C and D.
  • the logic signals obtained at the outputs of logic circuit 40 have been indicated.
  • first oscillator means providing a first plurality of pe riodic signals
  • first synchronizing means responsive to the receiver line scanning control signals, said first synchronizing means being coupled to said first oscillator means to produce line coherence of said first plurality of periodic signals;
  • first matrix means having a plurality of input and output terminals, said periodic signals of said first and second plurality and said further periodic signal being applied to said first matrix means, said matrix means mixing said periodic signals to provide a plurality of output signals;
  • said means for mixing said comparator means complex output signals includes:
  • said low frequency being less than the frequencies of any of said first or second plurality of periodic signals
  • said free running oscillator means output signal being displaced in frequency from the receiver line scanning frequency by a small amount
  • said first matrix means comprises: 1
  • each of said terminal means defining in part a pair of intersecting conductors of the matrix
  • plug means for insertion in said terminal means, said plug means including passive circuit elements of predetermined value whereby the mixture of the signals applied to the matrix and the potential of the mixing signals may be preselected.
  • said first matrix means comprises:
  • each of said terminal means defining in part a pair of intersecting conductors of the matrix
  • plug means for insertion in said terminal means, said plug means including passive circuit elements of predetermined value whereby the mixture of the signals applied to the matrix and the potential of the mixing signals may be preselected.
  • the apparatus of claim 12 further comprising:
  • said free running oscillator means output signal being displaced in frequency from the receiver line scanning frequency by a small amount

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Processing Of Color Television Signals (AREA)
US00276911A 1971-08-02 1972-08-01 Video signal generator Expired - Lifetime US3830974A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7128193A FR2150579A1 (fr) 1971-08-02 1971-08-02

Publications (1)

Publication Number Publication Date
US3830974A true US3830974A (en) 1974-08-20

Family

ID=9081298

Family Applications (1)

Application Number Title Priority Date Filing Date
US00276911A Expired - Lifetime US3830974A (en) 1971-08-02 1972-08-01 Video signal generator

Country Status (3)

Country Link
US (1) US3830974A (fr)
DE (1) DE2237286A1 (fr)
FR (1) FR2150579A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5883739A (en) * 1993-10-04 1999-03-16 Honda Giken Kogyo Kabushiki Kaisha Information display device for vehicle

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2739518B1 (fr) * 1995-10-02 1997-12-05 Dupouy Marcel Georges Marie Perfectionnements aux generateurs d'effets speciaux et d'images abstraites animees en video couleur

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2193869A (en) * 1937-07-09 1940-03-19 Alfred N Goldsmith Television control
US2240420A (en) * 1939-05-11 1941-04-29 Philco Radio & Television Corp Electrical system
US3612761A (en) * 1969-12-19 1971-10-12 Us Navy Large-area display system
US3706851A (en) * 1970-01-20 1972-12-19 Zeiss Stiftung Means for evaluating and displaying certain image portions occuring within a total image
US3718757A (en) * 1970-12-29 1973-02-27 Ibm Temperature monitoring
US3728480A (en) * 1969-03-18 1973-04-17 Sanders Associates Inc Television gaming and training apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2193869A (en) * 1937-07-09 1940-03-19 Alfred N Goldsmith Television control
US2240420A (en) * 1939-05-11 1941-04-29 Philco Radio & Television Corp Electrical system
US3728480A (en) * 1969-03-18 1973-04-17 Sanders Associates Inc Television gaming and training apparatus
US3612761A (en) * 1969-12-19 1971-10-12 Us Navy Large-area display system
US3706851A (en) * 1970-01-20 1972-12-19 Zeiss Stiftung Means for evaluating and displaying certain image portions occuring within a total image
US3718757A (en) * 1970-12-29 1973-02-27 Ibm Temperature monitoring

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5883739A (en) * 1993-10-04 1999-03-16 Honda Giken Kogyo Kabushiki Kaisha Information display device for vehicle

Also Published As

Publication number Publication date
FR2150579A1 (fr) 1973-04-13
DE2237286A1 (de) 1973-02-22

Similar Documents

Publication Publication Date Title
US4329710A (en) Color composing video system
US4149178A (en) Pattern generating system and method
US4093960A (en) Test signal generating system and method
US3309461A (en) Pseudo-random electron beam scanning system for narrow bandwidth image transmission
US3732360A (en) Color television system having aperture correction
US3757040A (en) Wide angle display for digitally generated video information
US2940005A (en) Variable discontinuous interlaced scanning system
US4267561A (en) Color video display for audio signals
US4888643A (en) Special effect apparatus
US4025946A (en) Method and apparatus for generating graphic designs
US3830974A (en) Video signal generator
US3879749A (en) TV test pattern and method of testing
US3700792A (en) Computer animation generating system
GB2023976A (en) Video display control apparatus
US4809072A (en) Method and apparatus for generating a video wipe border signal
US3342937A (en) Synchronizing of electron beam scanning in a narrow bandwidth pseudorandom dot scan television system
US3745242A (en) Multiplex tv system for transmitting and receiving a plurality of pictures on a line sharing basis
US2603706A (en) Scanning system for color television
DE69630264T2 (de) Gerät mit Speicherkontrolltabellen zur Videographikverarbeitung für TV-Empfänger
US3939487A (en) Color video signal generators
US3053931A (en) rudatis-
Hocking et al. Image Processing
US2881311A (en) Method and means for producing electrical waves
JPS6326173A (ja) 高品位テレビジヨン受信装置
GB1585772A (en) Method for producing a graphic design